Use nullptr_t for RefPtr, PassRefPtr and RawPtr.

Source/core/editing/ReplaceSelectionCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 321 matching lines @@
 {
     if (m_firstNodeInserted == node)
         m_firstNodeInserted = NodeTraversal::next(node);
     if (m_lastNodeInserted == node)
         m_lastNodeInserted = node.lastChild() ? node.lastChild() : NodeTraversal::nextSkippingChildren(node);
 }
 
 inline void ReplaceSelectionCommand::InsertedNodes::willRemoveNode(Node& node)
 {
     if (m_firstNodeInserted == node && m_lastNodeInserted == node) {
-        m_firstNodeInserted = 0;
-        m_lastNodeInserted = 0;
+        m_firstNodeInserted = nullptr;
+        m_lastNodeInserted = nullptr;
     } else if (m_firstNodeInserted == node) {
         m_firstNodeInserted = NodeTraversal::nextSkippingChildren(*m_firstNodeInserted);
     } else if (m_lastNodeInserted == node) {
         m_lastNodeInserted = NodeTraversal::previousSkippingChildren(*m_lastNodeInserted);
     }
 }
 
 inline void ReplaceSelectionCommand::InsertedNodes::didReplaceNode(Node& node, Node& newNode)
 {
     if (m_firstNodeInserted == node)
@@ skipping 754 matching lines @@
     if (!handledStyleSpans)
         handleStyleSpans(insertedNodes);
 
     // Mutation events (bug 20161) may have already removed the inserted content
     if (!insertedNodes.firstNodeInserted() || !insertedNodes.firstNodeInserted()->inDocument())
         return;
 
     // Scripts specified in javascript protocol may remove |insertionBlock|
     // during insertion, e.g. <iframe src="javascript:...">
     if (insertionBlock && !insertionBlock->inDocument())
-        insertionBlock = 0;
+        insertionBlock = nullptr;
 
     VisiblePosition startOfInsertedContent = firstPositionInOrBeforeNode(insertedNodes.firstNodeInserted());
 
     // We inserted before the insertionBlock to prevent nesting, and the content before the insertionBlock wasn't in its own block and
     // didn't have a br after it, so the inserted content ended up in the same paragraph.
     if (insertionBlock && insertionPos.deprecatedNode() == insertionBlock->parentNode() && (unsigned)insertionPos.deprecatedEditingOffset() < insertionBlock->nodeIndex() && !isStartOfParagraph(startOfInsertedContent))
         insertNodeAt(createBreakElement(document()).get(), startOfInsertedContent.deepEquivalent());
 
     if (endBR && (plainTextFragment || (shouldRemoveEndBR(endBR, originalVisPosBeforeEndBR) && !(fragment.hasInterchangeNewlineAtEnd() && selectionIsPlainText)))) {
         RefPtr<Node> parent = endBR->parentNode();
@@ skipping 218 matching lines @@
     if (m_selectReplacement)
         setEndingSelection(VisibleSelection(start, end, SEL_DEFAULT_AFFINITY, endingSelection().isDirectional()));
     else
         setEndingSelection(VisibleSelection(end, SEL_DEFAULT_AFFINITY, endingSelection().isDirectional()));
 }
 
 void ReplaceSelectionCommand::mergeTextNodesAroundPosition(Position& position, Position& positionOnlyToBeUpdated)
 {
     bool positionIsOffsetInAnchor = position.anchorType() == Position::PositionIsOffsetInAnchor;
     bool positionOnlyToBeUpdatedIsOffsetInAnchor = positionOnlyToBeUpdated.anchorType() == Position::PositionIsOffsetInAnchor;
-    RefPtr<Text> text = 0;
+    RefPtr<Text> text = nullptr;
     if (positionIsOffsetInAnchor && position.containerNode() && position.containerNode()->isTextNode())
         text = toText(position.containerNode());
     else {
         Node* before = position.computeNodeBeforePosition();
         if (before && before->isTextNode())
             text = toText(before);
         else {
             Node* after = position.computeNodeAfterPosition();
             if (after && after->isTextNode())
                 text = toText(after);
@@ skipping 125 matching lines @@
         removeNodeAndPruneAncestors(nodeAfterInsertionPos.get());
 
     VisibleSelection selectionAfterReplace(m_selectReplacement ? start : end, end);
 
     setEndingSelection(selectionAfterReplace);
 
     return true;
 }
 
 } // namespace WebCore